Uponor, formerly known as Wirsbo, is a leading manufacturer and supplier of Plumbing, Heating/Cooling, and Fire Safety Systems for residential and commercial building applications. Wirsbo 3/8" Wirsbo hePEX, 1,000-ft. coil hePEX tubing (A1220375) is made of a high quality polyethylene layer that is extruded over the EVOH barrier to protect from site abuse and moisture saturation. The hePEX tubing is used for closed-loop radiant heating applications and has an EVOH oxygen diffusion barrier that meets German DIN 4726.Approved fitting systems include ProPEX and APRAdditional Information:Manufacturer Specification Sheet (PDF File)